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Scanner Problem

I have a Mustek 1200 III EP Scanner. When I plug the scanner in (power cord) my high speed internet slows to a crawl and sometimes the red lights on the DSL Modem come on and I have no internet connection at all. The power supply for the scanner gets very hot also. I tried changing the parrallel port setting from SPP to EPP which helped keep the DSL lights green, but connection very very slow. Anyone have any idea what could be causing this?

All Comments

Scanner Problem

It sounds like there is a problem with either the power supply, or the scanner itself.

I suspect that when the scanner is plugged in, high frequency noise is being placed on the power line. That could explain the strange symptoms that you have.I have a Mustek 1200 III LP, and the power supply only gets warm.

Try plugging in the power supply without the power cable plugged into the back of the scanner.

If all is fine now, the problem is probably inside the scanner. I would suspectthe circuitry that powers the lamp.

If you still have the problem, and the power supply still gets hot, the problem is in the power supply. See if you can get a new supply from Mustek.

While not likely, it is also possible that noise is beingtransmitted to the printer port.See if the problem goes away if you unplug the scanner cable from the PC.

If it is the scanner, it may be cheaper to buy a new one than to get yours repaired. Take a look at the USB port scanners.

Scanner Problem

Unplugging the scanner from the computer solves the problem with my high speed internet. Does this mean my scanner is shot or should I try a new cable? What would cause noise to be transmitted to the printer port? A bad power supply?

Scanner Problem

Okay,Did you try plugging in the power supply without having the power supply connected to the scanner?

If the power supply stays cool when it is plugged in to the AC, but not plugged into the scanner, then I would suspect that the problem is in the scanner itself.If the power supply still gets hot, then I would suspect the power supply.

If you have a friend who is into electronics, they could test the power supply for you. I would connect the output to an oscilloscope, and look for noise both loaded and unloaded.

If the power supply is bad, it is possible that the scanner is bad too. The only whay to find out would be to test it with another power supply.

Unless the cable has been pinched, or shows some other physical damage, the odds are that it is fine. However, it is simple enough to test a different cable.

Hope this helps.

Chas

Oh, you didn't say, does the scanner function?If so, I would suspect the circuitry that runs the lamp, or the lamp itself asthe source of the noise.

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